Improvement in stop-motions for circular-knitting machines



' working parts of the machine.

s v UNITED 'STATES PATENT Ormea.

PHIL() W. HART, OF STAMFORD, NEW YORK, ASSIGNOR TO THE DALTON KNITTINGMACHINE COMPANY OF THE CITY OF NEYV YORK, N." Y.

IMPROVMENT INV STOP-MOTIONS FOR ClRCUtARKillTTlNG MACHINES.

Specification forming part of Letters Patent NO. 46,186. dated January3l, 1855.

To all uhom it 'may concern Be it known that I, PuILo W. HART, of

, Stamford, in the county ot'Delaware and State ot' New York, haveinvented a new and Improved Stop-Motion for Circular-Knitting containingthe needles is stationary and the yarn bobbin or bobbins revolve aroundthe said cylinder.

It consists in a slide attached to the revolving bobbin-stand andcarrying a pin or piece which enters a notch provided in the bobbin, andwhich is held in the said notch by the yarn upon the bobbin, but which,when liberated by the running of nearly all the yarn oli' the bobbin,permits the slide to fly out by centrifugal force to a position tostrike and liberate the shipper, and so cause the stop page of themachine.

To enable others skilled in the art to make and use my invention, Iwillproceed to describe its construction and operation.

A is the bed-plate, which supports all the Bis the main shaft, furnishedwith fast and loose pulleys C D, to receive the driving-belt, and withabevelgear, E, which drives the horizontal rotating` plate F, whichcarries the bobbin-stand G and the feeding and cast-ott mechanism, thesaid plate being toothed around its edge to gear with the said gear E.The needle ring or cylinder is not represented.

The bobbin-stand G is bolted securely to the plate F, and has firmlysecured in it the pin a, over which the eye of the bobbin H is tightlyinserted, so that it will not be turnedv by the draft of the yarn. Thebobbin is of ordinary construction, except that it has a longitudinalgroove, b, cut in one side. In putting the bobbin on the pin a care mustbe taken to set the groove b outward or in the farthest position fromthe center of the machine.

I is the slide, and c the attached pin or piece, which, in combinationwith the groove b in the bobbin, constitutes my invention. The slide Iconsists of' a straight piece of iron fitted to slide radially towardand from the center ot' ihe machine in a guide, f, secured to the bottomot' that part of the bobbin-stand which overhangs the plate F, and thepin or piece c, which is rigidly secured to the outer end otl the saidslide, is intended to be received in the groove b in the side of thebobbin. The said slide is furnished on its under side with a stop, d, toprevent it from being thrown out entirely from the bobbinstand by thecentrifugal force developed in its revolution, and it is also furnishedwith a pin, e, to act upon the device which liberates the belt-shipper.4Before putting a full bobbin H on the pin a the slide I is pushed backtoward the center of the plate F till its piu c comes in contact withthe end of the bobbin-stand, which stops it in such position that inputting the bobbin on the pin a the pin c will enter the groove b, andso pass under the yarn on the bobbin.

In the operation of the machine the pin o is held in the groove b of thebobbin by the yarn, and the pin e is thus kept in such a position thatit will not interfere with the device which4 locks and unlocks theshipper-lever J until the yarn has so nearly all run ott the bobbin thatit leaves the pin o uncovered. The centrifugal force developed in theslide I by its revolution then causes it to slide outward as far aspermitted by the stop d, and the pin e is thus brought to a position inwhich it unlocks the shipper, and so causes the stoppage of the machine.

The shipper-lever J may be applied to operate either in combination withi'ast and loose pulleys, as represented, or with a clutch, and may belocked and unlocked by any suitable device upon which. the pin e canoperate in a proper manner to stop the machine; but for illustration ofthe operation of the slide I it per-lever.

will be sufficient to describe the arrangement shown in the drawings forstopping the inachine.

The shipper-lever J is arranged to work on a fixed fulcrum, g, and hasapplied to it a spring, h, which exerts a constant tendency to pull andhohl it to a position to keep the belt on the loose pulley D. The devicefor locking it in a position to keep the belt on the fast pulleyconsists as follows: K is a spindle, working in a bearing in thebed-plate A and in another bearing in a hanger, L, which also supportsthe fulcruin pin' g of the ship- To the upper part ot' this spindle,which projects above the bed-plate A, there is secured an arin, l, andthrough the lower part there is screwed a screw, m, the point-of whichacts as a stop to the shipper-lever when the latter is in a position tohold the belt on the fast pulley, as shown in Fig. l. This screw is soarranged that when it is thus in operation the pressure of the leveragainst it, produced by the spring h, holds its point lrmly against ahook, a, attached to the lever, and so prevents the spindle K fromturning. When the shipper is brought to the abovementioned position, thescrew m is brought up against the hook a by means ot' a spring, p, whichis coiled around the spindle in such manner as to exert a constanttendency to turn it in the direction ot' the arrow shown near 1t in Fig.l, and this spring, in bringing the screw m to that p0sition,brings thearm l to a position which is within the range ot' the revolution of thepin e on the slide I, when the latter has been thrown out from thecenter of the plate F by centrifugal force, as hereinbet'ore described,but out ofthe range ofthe revolution of said pin when the pin or piece,c is confined within the groove bof the bobbin by the yarn thereon. Whenthe pin or piece c is liberated by the running of the yarn .off theportion of the bobbin which receives it, and the slide I is thrown outby centrifugal force to the position shown in Fig. 3 and in red outlinein 2,the pin e, in its continued revolution, strikes the arm l, andthereby turns the' spindle K so far in the opposite direction to that inwhich the spring p acts upon it that it brings the Screw m to such anoblique position relatively to the shipper-lever as no longer to stopit, but to allow the said lever to be brought by the spring h to aposition to ship the belt from the fast pulley C to the loose pulley Dand stop the machine.

ln order that the machine shall be stopped before the yarn has entirelyrun ott' the bobbin, and so to prevent holes in the work, the winding otthe yarn on the bobbin is coinmenced on the upper part, above where thepin or piece c is received within it.

The employment for actuating the stop-niotion of the pin or piece c,entering a groovein the bobbiu, but attached toa slide or its equivalenttted to the bobbin-stand, is much less expensive and more convenientthan the use of a movable piece attached directly to the bobbin itself,as in the latter case every bobbin has to be furnished with a separatemovable piece, while in the former case no addition to the bobbin isrequired, and the only alteration of it is the cutting ota groove in oneside.

What I claim as my invention, and desire to secure by Letters Patent,is-

The movable pin or piece c, in combination with the slide l, or itsequivalent, attached to the bobbin-stand, and with a groove or recess inthe bobbin, substantially as and for the purpose herein specitied.

PHIL() W. HART.

Witnesses:

AMBRosE STEvENsoN, ANGELINA BALDWIN.

